001    /*
002     $Id: MethodPointerExpression.java 3419 2006-01-19 00:07:02Z blackdrag $
003    
004     Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005    
006     Redistribution and use of this software and associated documentation
007     ("Software"), with or without modification, are permitted provided
008     that the following conditions are met:
009    
010     1. Redistributions of source code must retain copyright
011        statements and notices.  Redistributions must also contain a
012        copy of this document.
013    
014     2. Redistributions in binary form must reproduce the
015        above copyright notice, this list of conditions and the
016        following disclaimer in the documentation and/or other
017        materials provided with the distribution.
018    
019     3. The name "groovy" must not be used to endorse or promote
020        products derived from this Software without prior written
021        permission of The Codehaus.  For written permission,
022        please contact info@codehaus.org.
023    
024     4. Products derived from this Software may not be called "groovy"
025        nor may "groovy" appear in their names without prior written
026        permission of The Codehaus. "groovy" is a registered
027        trademark of The Codehaus.
028    
029     5. Due credit should be given to The Codehaus -
030        http://groovy.codehaus.org/
031    
032     THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
033     ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
034     NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
035     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
036     THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
037     INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
038     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
039     SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
040     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
041     STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
042     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
043     OF THE POSSIBILITY OF SUCH DAMAGE.
044    
045     */
046    package org.codehaus.groovy.ast.expr;
047    
048    import groovy.lang.Closure;
049    
050    import org.codehaus.groovy.ast.ClassHelper;
051    import org.codehaus.groovy.ast.ClassNode;
052    import org.codehaus.groovy.ast.GroovyCodeVisitor;
053    
054    /**
055     * Represents a method pointer on an object such as
056     * foo.&bar which means find the method pointer on foo for the method called "bar"
057     * which is equivalent to
058     * <code>
059     * foo.metaClass.getMethodPointer(foo, "bar")
060     * 
061     * @version $Revision: 3419 $
062     */
063    public class MethodPointerExpression extends Expression {
064    
065        private Expression expression;
066        private String methodName;
067    
068        public MethodPointerExpression(Expression expression, String methodName) {
069            this.expression = expression;
070            this.methodName = methodName;
071        }
072    
073        public Expression getExpression() {
074            if (expression == null)
075                return VariableExpression.THIS_EXPRESSION;
076            else
077                return expression;
078        }
079    
080        public String getMethodName() {
081            return methodName;
082        }
083    
084        public void visit(GroovyCodeVisitor visitor) {
085            visitor.visitMethodPointerExpression(this);
086        }
087    
088        public Expression transformExpression(ExpressionTransformer transformer) {
089            Expression ret;
090            if (expression == null) {
091                    ret = new MethodPointerExpression(VariableExpression.THIS_EXPRESSION, methodName);
092            } else {
093                    ret = new MethodPointerExpression(transformer.transform(expression), methodName);
094            }
095            ret.setSourcePosition(this);
096            return ret;        
097        }
098    
099        public String getText() {
100            if (expression == null) {
101                return "&" + methodName;
102            } else {
103                return expression.getText() + ".&" + methodName;
104            }
105        }
106    
107        public ClassNode getType() {
108            return ClassHelper.CLOSURE_TYPE;
109        }
110    
111        public boolean isDynamic() {
112            return false;
113        }
114    
115        public Class getTypeClass() {
116            return Closure.class;
117        }
118    }